An airplane cleaner was cleaning the cockpit when he saw a book on the pilot's seat titled:

"How to Fly for Beginners (Page 1)"

He opened the first page of the book, where it was written:

"Press the red button to start the engine."

He followed the instructions, and the plane's engine started.

Seeing this, he became very happy.

Then he went to the next page, where it was written:

"Press the blue button to set the airplane in motion."

He pressed the button, and the plane started moving at an amazing speed.

Now he was eager to fly the plane, so he opened the third page, where it was written:

"Press the green button to fly the airplane."

He pressed the button, and the plane soared high into the sky.

He was extremely excited!

But the trouble began then...

After a 20-minute flight, he thought about landing.

Therefore, he opened the fourth page to find the instructions.

But on the fourth page, it was written:

"To know the method of landing, please purchase Book 2."

Lesson and Advice:

Never do any work without complete information.

Incomplete knowledge is not just dangerous, but catastrophic!